Manufacture of horseshoe nails



July 14, 1931.

H. c. H. MUSTAD MANUFACTURE OF HORSESHOE NAILS Filed Apfil 24, 1928 Patented July 14, 1931 1 UNITE a PATENT Fries HANS CLARIN novmn- MUSTAD, on osLo, nonwai-nssrenon T0 0. Muslim) & son or OSLO, NORWAY MANUFACTURE or HORSESHOE NAILS A ii atio fiiedr ru 24, 1928} Serial n 272,529; and in Germany April 26, 1927.

This invention relates to a process and means 'rorflmak ing ho rse'shoenails.

I nmachines for making; horseshoenails from a continuous wire or rodby the coldpr'e's'si process (see for instance U. S. Pat. 1,010,515) generally calledlth'e four-die process,; the" pressing operation is carried out by fear dies working'abdut radially against the Wire thereby forming the shank of the and pre'paringthe form of the head. The completion ofthe forming of the head is after severing the'blank fromthe end of the; Wireer mamas; by means of a jumpifig' tool. In order however that the latter tool shall produce a per-feet form of the head it has been usual-to repeat the pressg ing' operation t vice so that the tape're'd part-- between the shank and the head proper is shortened. It is ohviouarhat-this repeating 6f the pressing operation represents a loss of time and as each-of the toolsof the macliinehas maximum of speed above" which they can iiot,advantageously be worked-the e'fiicie'ncy' eras machine is greatly reducedby this repeated action of the pressing dies;

According to the present invention this drawback is" overcome by carrying" out the two steps in thepressin'g operation by means oft vvo separate presses acting simultaneo'usly; one ,(the main press) on the end of the,-v'vire before severingtheblank from thesalne' and; one (the auxiliary press) on the bltiik after it has been Severed frOlii the fivire. and carried to another stat-ism in the machine. By carrying out the process in this manner the machine can be made to about 50% more r'e'yolutions a minute, Without increasing the actual speed of the Working tools during] their operation.

To explain the processand the preferred means for Carrying it out more fully reference is had totheaiineized drawings in which Fig. 1.is a side View vof {the blank carrier or transporting mechanism, as generally used in such, machines; Fig. 21s a vertical cross section through a horseshoenail machine. taken in front of said blank carrier, and showing the, auxiliary press me'chanisni' in elevation; Fig. 3 is a plan view eras atiitiliary press mechanism;

Fig. 4 is a sketch (side View) of so' much of the machine as necessary to indicate the relative position of the operative parts.

Referring to Fig. 4 W indicates the from Which the nails are made and which 1s fed into the press 10 by means of the feeding arm l1. 12 is the jumpin tool placed at the other end of the" machine inline with the wire. 1 the blankfcarrier, serving to transport the blanks from the press 10 to the jumping tool 12. This carrier is shown in the form of a fourarmed cross, but it may also have eightarn r's; In the machines of usual constrnction the blank is pressed twice in the press" 10, then severed from the wire, grasped by one ofthe' transporter arm, n carried first dowlt Wards by a 90 rotation of the carrier and then up to the jumping tool.

Finally itis carried to the top position of the carrier arm,- Where it is thrown out of the machine. It will, be, seeri, that at its lov'ver station (at b) the blank is not acted upon by any tool: and the object of this in vention is to utilize this station for the second press operation.

This second or auxiliary press may have any de'sirable construction, but 'inust allow of the passing of the blank laterally in and out from the dies before and a'fte'r'the press operation.

As shown in the' drawings the four dies of the press which may be of any Wellknovvn' type, are arranged in pairs in heads 2 forming parts of levers 3 pivoted at at. These leve'rs rest on cams 5 and at their ends are connected with knlicklejoint members 6 Working in adjustable bearings 9 in the frame 8 of the machine. The bore in the levers for the pivots 4 is oblong so as to allow of'motion of the levers in their longitudinal direction when the cams lift their outer ends. 7 is a flat spring or yielding plate serving as a rest forthe end of the blank duringthe pressing operation so that the blank (6), which When acted upon by the pressing dies, Will be moved downward 1y, will as soon as the dies again go apart, lift the blank .to its iiiitial position. It vvou-ld otherwise,- When'being Carried to the station 0, not have the correct position relatively to the jumping tool.

In operation, the rod stock IV is fed by means of the feeding device 11 to the first four-die press 10. The four-die here simultaneously reduces a portion of the rod stock forming a shank. The rod stock with the shank is then fed out into the chuck of the revolving carrier 1, see Fig. 1, the shank being denoted by a. A severing device associated with the first four-die press then cuts off an appropriate length from the rod stock leaving the rather elongated head portion, shown adjacent the shank a in Fig. 1. The revolving carrier then rotates to the position indicated at b in Fig. 1. On account of the construction of this carrier it must make a lateral transit into the second four-die press 2 shown in Fig. 3, consequently the dies of this press are carried in pairs with a free lateral space between said pairs through which the nail blank may pass upon entering and leaving the second die press. In this press as is indicated in Fig. 2, the four-dies come together upon the part of the elongated head portion adjacent the shank reducing its diameter so that it becomes in fact a part of the shank, leaving the head portion much reduced in length. The press in the second four-die press elongates the nail blank, the spring 7 yielding under this elongation while the nail blank is gripped by the dies of the press 2. When the die is opened, the spring 7 pushes the nail blank further into the chuck of the carrier restoring the length of that part which projects from the chuck to its original length, this being necessary in order that the nail blank should be positioned properly with respect to the jumping tool. The carrier 1 then revolves to the position indicated at 0 in Fig. 1 at which point the head is operated upon by the jumping tool 12 shown in Fig. l. The carrier then revolves to the point d at which point the finished nail is grabbed by suitable ejecting means, not shown.

Instead of the knucklejoint-lever mechanism shown the pressheads 2 may of course be operated by any usual mechanism for such purpose, for instance a regular crank.

Instead of placing the carrier as shown in a vertical position, it may rotate in a horizontal plane.

What I claim is:

1. In a machine for making horseshoenails the combination with a carrier having a step by step movement and having grippers to hold the shank of a horseshoenail radially by friction, of a press of the four die type having two pairs of dies, each pair mounted on a movable holder capable of a lateral movement relative to the blanks held by said grippers, thereby allowing the blank to enter the space between the two pairs of dies in a lateral direction at right angles to the movement of said die holders, and a spring or other yielding member so placed below the dies that during the press operation the head of the nail blank may have a yieldable rest on said member, the latter serving also to further push the shank of the blank into the gripper device of the carrier after the end of the pressing operation to restore the former extent of its protrusion, and a jumping tool for operating upon the head of said blank in another position of said carrier.

2. A machine for making horse shoe nails comprising a first four-die press, means for feeding rod stock to said four-die press, the latter pressing a shank portion on said rod stock, means for severing a nail blank from said rod stock, including said shank and an elongated head portion, a carrier for gripping said shank portion for conveying it to the means for performing subsequent operations, a second four-die press for pressing part of said head portion to form a longer shank and a shorter head, yielding means engaging the end of said head portion while the second pressing takes place yielding to the elongation of said nail blank, said yielding means pushing said nail blank further into said carrier to restore the former extent of its protrusion, and a jumpin tool for operating upon the head of sai nail blank, in another position of said carrier.

3. A machine for making horse shoe nails comprising a first four-die press, means for feeding rod stock to said four-die press, the latter pressing a shank portion on said rod stock, means for severing a nail blank from said rod stock, including said shank and an elongated head portion, a revolving carrier for gripping said shank portion for conveying it to means for performing subsequent operations, a second four-die press into which said nail blank is laterally fed by said carrier, said second four-die press being arranged to press part of said head portion to form a longer shank portion and a shorter head, the dies of said second four-die press being arranged in pairs to provide a lateral passage for the transit of said nail blank in said carrier, yielding means engaging the end of said head while the second pressing is taking place, said means yielding to the elongation of said nail blank, said yielding means pushing said nail blank further into the chuck of said carrier to restore its former extent of protrusion, and a jumping tool for operating upon the head of said nail blank, in another position of said carrier.

4:. A machine for making horse shoe nails comprising means for pressing out on a portion of a fed rod stock a shank, means for severing from said rod stock a part including said shank and an elongated head portion, means for pressing the head portion after severance, to form a longer portion of the shank and a shorter head, means for holding the shank during said head pressing operation so that the elongation due to the pressing takes place in the direction of the head, means for shifting the point at which the nail blank is held so as to restore the original length of the free portion of the nail blank rotruding from said holding means to W lat it was before being elongated, and a jumping tool for operating on the head portion.

In testimony whereof I have signed my name on to this specification.

HANS CLARIN HOVIND. MUSTAD. 

